<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
      class Person{
          constructor(name,age){
              this.name=name;
              this.age=age;
          }
          sayName(){
              console.log(this.name)
          }
      }
      class Student extends Person{
          constructor(name,age,school){
              super(name,age);
              this.school=school;

          }
      }
      var wang=new Student("王晶",18,"湖大执行");
      wang.sayName();
    </script>
</body>
</html>